Hypoparathyroidism is a rare disorder in which parathyroid hormone (PTH) is markedly decreased or absent from the circulation. It is the only remaining hormone deficiency state for which replacement with the missing hormone has been heretofore unavailable. The hypoparathyroid state is due either to autoimmune destruction of the parathyroid glands or to loss of parathyroid function after neck surgery. Without PTH, calcium homeostasis is markedly abnormal, the most salient clinical feature of which is a reduced serum calcium concentration. The hypocalcemia is associated with other important abnormalities such as markedly reduced parameters of bone turnover. PTH (1-84) is the ideal therapeutic approach to hypoparathyroidism. The current mainstay of therapy, calcium and vitamin D, has important clinical limitations. Large doses of calcium and vitamin D are required and often associated with hypercalciuria and vitamin D toxicity. Moreover, this approach does not correct the skeletal deficiencies resident in the bones themselves due to lack of PTH. In contrast, PTH (1-84) replaces precisely what is missing in this disorder. Our research question is: What are the long-term safety and efficacy parameters of PTH(1-84) therapy in hypoparathyroidism?

Preliminary data suggest that treatment with PTH(1-84) for up to 4 years improves control of the serum and urine calcium concentration safely.

Since hypoparathyroidism is a chronic disorder, it is important to know whether these salutary effects continue to be seen beyond 4 years. There is a need to determine the safety and efficacy treatment of PTH(1-84) in hypoparathyroidism beyond 4 years.

For Returning Participants or participants graduating from one of the parent studies:

Inclusion Criteria:

Must have participated in and concluded the CL1-11-040, PAR-C10-007 or PAR-C10-008 Study at any site in the continental United States

Must have participated in and concluded the Hypopara Study at Columbia University

Exclusion Criteria:

failure to have completed either of the inclusionary studies

For New Participants (20 anticipated):

INCLUSION CRITERIA:

Signed and dated informed consent form (ICF) before any study-related procedures are performed.

Adult males or females 18 to 85 years of age.

History of hypoparathyroidism for ≥ 18 months, including evidence of hypocalcemia and concomitant serum intact PTH concentrations below the lower limit of normal within 12 months prior to Baseline.

Requirement for calcitriol ≥0.25 mcg per day per day prior to Baseline.

Requirement for supplemental oral calcium ≥ 1500 mg per day between supplemental and dietary sources.

Serum thyroid function tests within normal laboratory limits at screening for all subjects not receiving thyroid hormone replacement therapy. For patients on thyroid hormone replacement therapy, the dose must have been stable for at least 3 months prior to screening

serum creatinine < 1.5 mg/dL on a single measurement prior to use of study drug

Willingness and ability to comply with the protocol (prior to screening).

With regard to female patients: Women of childbearing potential must have a negative pregnancy test at Screening and agree to use two medically acceptable methods of contraception for the duration of the study with pregnancy testing at every scheduled visit.

EXCLUSION CRITERIA:

Patients who have any of the following during the screening visit are not eligible for enrollment in this study:

Known history of hypoparathyroidism resulting from an activating mutation in the CaSR gene or impaired responsiveness to PTH (pseudohypoparathyroidism). If unknown, it shall be assumed to be not-present.

To be eligible, patients with a history of thyroid cancer must be documented to be disease-free for a period of at least 5 years (or 2 years with evidence of follow up and a doctor's note of clearance).

Any disease or condition in the opinion of the Investigator that has a high probability of precluding the patient from completing the study or where the patient cannot or will not appropriately comply with study requirements.

Participation in any other investigational trial in which receipt of investigational drug or device occurred within 6 months prior to screening for this study.

Pregnant or lactating women.

History of diagnosed drug or alcohol dependence within the previous 3 years.

Clinical history of renal calculi within the past 6 months.

Any condition that negatively affects gastrointestinal absorption, including but not limited to short bowel syndrome, bowel resection, tropical sprue, celiac disease, ulcerative colitis, and Crohn's disease.

History of cerebrovascular accident (CVA) in the past 5 years or earlier, if there is residual impairment that would affect participation in the study.

Contacts and Locations

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For general information, see Learn About Clinical Studies.

Please refer to this study by its ClinicalTrials.gov identifier: NCT01199614